docs(gov): remove stores & proposal processing queue (backport #22143)

[mergify]

removed in here:deec679#diff-3b932fd329b6630207a4705ca1acf774004af9f6e52b7ae7eba0cba8cbb893c1L433
So I think we should delete the table of the content too.

Summary by CodeRabbit

• Documentation
  • Enhanced clarity and detail in the Governance module documentation.
  • Expanded sections on proposal submission, voting rights, and deposit handling.
  • Added new proposal types and clarified voting mechanics, including quorum definitions.
  • Improved descriptions of message types and emphasized metadata importance for proposals.

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This is an automatic backport of pull request #22143 done by [Mergify](https://mergify.com).

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